CVE-2021-37186

Summary

A vulnerability has been identified in LOGO! CMR2020 (All versions < V2.2), LOGO! CMR2040 (All versions < V2.2), SIMATIC RTU3010C (All versions < V4.0.9), SIMATIC RTU3030C (All versions < V4.0.9), SIMATIC RTU3031C (All versions < V4.0.9), SIMATIC RTU3041C (All versions < V4.0.9). The underlying TCP/IP stack does not properly calculate the random numbers used as ISN (Initial Sequence Numbers). An adjacent attacker with network access to the LAN interface could interfere with traffic, spoof the connection and gain access to sensitive information.

Affected Software

VendorProductVersion RangeStatus
SiemensLOGO! CMR2020All versions < V2.2affected
SiemensLOGO! CMR2040All versions < V2.2affected
SiemensSIMATIC RTU3010CAll versions < V4.0.9affected
SiemensSIMATIC RTU3030CAll versions < V4.0.9affected
SiemensSIMATIC RTU3031CAll versions < V4.0.9affected
SiemensSIMATIC RTU3041CAll versions < V4.0.9affected

Weaknesses

  • CWE-330: CWE-330: Use of Insufficiently Random Values

ADP Enrichment

CVE Program Container

Additional References

References